低空白采样方法用于测量大气NOx中同位素成分
Kazuki Kamezaki1, Takahisa Maeda1, Shigeyuki Ishidoya1
1Environmental Management Research Institute, National Institute of Advanced Industrial Science and Technology (EMRI/AIST), Tsukuba, Japan.
一种新方法有效地使用过氧化和氧化收集大气中的氧化 (NOx). 这种技术提供了高收集效率和低空白,简化了对汽车废气等NOx来源的分析.
科学领域:
- 环境化学环境化学
- 大气科学 大气科学
- 同位素地球化学 同位素地球化学
背景情况:
- 氧化物 (NOx) 的同位素组成对于源和沉估计至关重要.
- 现有的大气氧化 (NO) 和二氧化 (NO2) 收集方法往往缺乏对收集效率和空白的彻底评估.
- 准确的NOx分析需要可靠的样本采集技术.
研究的目的:
- 开发和介绍一种新的,有效的方法,同时收集环境氧化 (NO和NO2).
- 评估拟议的氧化物收集方法的收集效率,空白水平和精度.
- 应用开发的方法来分析城市环境中NOx的同位素组成.
主要方法:
- 同时采集环境NOx (NO和NO2),使用3重%过氧化 (H2O2) 和0.5M氧化 (NaOH) 溶液.
- 收集效率的评估,NOx达到90%以上.
- 确定低空白水平 (大约0.5μM) 和同位素分析,不确定性为±1.2 ‰.
主要成果:
- 开发的方法证明了环境NOx的高收集效率 (>90%) 和低空白 (<0.5μM).
- 对NOx的同位素成分进行了成功的分析,精度为±1.2 ‰.
- 在日本的 Tsukuba 和 Yoyogi 站点进行的现场测量显示,平均 δ15N ((NOx) 值分别为 (-1.7 ± 0.9) ‰和 (-2.7 ± 1.8) ‰.
结论:
- 提出的方法是便携式,简单和高效的,用于在短时间内收集环境NOx样本进行同位素分析.
- 观察到的同位素成分表明,车辆的排气是日本两个研究的城市地点的主要NOx来源.
- 这种技术为大气NOx来源分配研究提供了有价值的工具.
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